Drop-hammer



O.R.CLAHK AND C.H.FRANKLIN. DROP HAMMER. APPLICATION FILED JAN. 31,1919.

2 SHEETS-SHEET l.

Inventors:

Otis RClark, Charles H.Franklin,

Their Attorngy.

0. R. CLARK AND C. H. FRANKL|N.'

DROP HAMMER.

APBLICATION FILED JAN. 31, E919 1,393,501, I Patented Oct. 11,1921.

I 2 SHEETSSHEET 2- Fig. 5

Inventors: Otis R'Clark, eyes H.Fr"anklm,

their Attorneg UNITED STATES PATENT OFFICE.

OTIS R. CLARK AND CHARLES H. FRANKLIN, OF SCHENECTADY, NEW YORK,

ASSIGNORS TO GENERAL ELECTRIC COMPANY. A

YORK.

CORPORATION OF NEW DROP-HAMMER.

To all whom it may concern:

Be it known that we. Orrs R. CLARK and Cnanurs H. FRANKLIN, citizens ofthe United States. residin at Schenectady, county of Schenectady, t'ateof New York, have invented certain new and useful Improvements inDrop-Hammers, ofi'which the following is aspecification.

' The present invention relates to drop hammeisand particularlyto whatis commonly known as board drop hammers. Such hammers comprise a heavyweight termed the hammer which moves vertically between two side framesor guides, and has. attached to it a board which extends up betweentworollers which may be moved into and out of engagement with the board. Inoperation, the rollers. which are continually operatino are moved tofrictionally engage the board on opposite sides to lift it after whichthey release the board and permit the hammer to drop. As isbbvious. the.two rollers must rotate in opposite directions. Heretofore, as far as weare aware. the rollers of drop hammers have in practice always beendriven by wheels and belts from line shafting. one of the belts of eachpairof wheels being crossed to give the desired direction of rotation.This crossing of belts is objectionable from a practical standpoint forthe reason that such belts wear-n'mch more rapidly than ordinarystraight belts. and for the further reason that the crossed belt coversmore surface on the wheel or pulley than Specification of LettersPatent. Patented Oct, 11 1921 Application filed January 31, 1919. SerialNo. 274,273.

sheared ofi'.- Line shaftin'g means' that the building structure must beheavier than is otherwise necessary. To offset the tension of the beltsit is customary to use guy rods which are anchored to some part of thebuilding. It is necessary-to support the hammer on some sort of acushion which yieldstmore or less, and any undue tension or slackness ofa belt, due to-nnequal tens on of the guy rods or any other cause, isaccompanied by a' correspdnding change in relation'of the top and bottomdies used in the hammer which is detrimental tothe nished product. i l

The objectof thepresent invention is to overcome theabove notedobjections and to provide an improved arrangement of drop hammer drivingmechanism whereby each hammer is self contained. including all thedriving wheels. beltsand driving motor. and

wherein the correct relation of parts is preserved at all times.

A drop hammer when in operation sets up vibrations of considerablemagnitude and a further object of our invention is to provide anarrangement in a motor driven drop hammer wherein vibrations from thehammer will not be transmitted to any great extent to the motor.

I For a consideration of what we believe to be novel and our invention.attention is directed to the accompanying description and the claimsappended thereto.

, Inthe drawing. Figure 1 IS a side elevathe straight belt. giving riseto a certainftion of a motor driven drop hammer eininequalitv of action.The use of line shaft-j ing is highly objectionable. -lt has to besuspended from the roof of the building or from pillars. which eithermakes it impossible or greatly interferes with the use of overheadcranes' Any. trouble affecting the line shaft or a hammer causes thewhole line of machines to be affected to a greater or lesser extent.usually the whole line has to be shut down. On account of the noise in ahammer shop it is very difiicult or impossible to detect small faultsandas a result the apparatus is usually: run until something breaks.necessitating a shut down.

The use of a line shaft also necessitates locating the hammer in somedefinite position'in the shop which is in many cases highlyobjectionable. Such shafts fre 'quently get out of line. the couplingsbreak bodying our. invention; Fig. 2 is an end view of the motor end ofthe drop hammer; Fig. 3 is a top plan view of the motor end;

and Fig. 4 is a plan view of the hammer end indicates the hammer orweight. 8 the mem-- ber commonly termed a board attached thereto. and 9the side. frames or guide. The board passes between friction rollers 10to the drop hammer frame.

Q l v v 1,393,501

and 11 which are carried by shafts l2 and 13. On shaft- 12 is a pulleyor belt .wheel' 14. and on shaft 13 is a pulley or belt wheel 16indicates the usual control levers for the drop hammer. ,As is wellunderstood the two belt wheels 14 and 15 are rotated in oppositedirections when the drop hammer is in operation.

Now, according to our invention, we provlde an electric motor to drivethe two belt wheels of the drop hammer, which motor is inounted on theouter end of a supporting member, the inner end of which is fastened Theouter end of the supporting member issupported on a tower or columnbuilt up from the floor.

-It is preferable to'a-ttach the inner end ofthe support to the frame bya hinge joint since this obviatcsthe necessity of extreme accuracy inthe settin scof thehammer frame and tower with respect to each other.Further thearrangemcnt ermits the hammer frame to settle slight ywithout" stressing the supporting member as it other? wise woulddo.Where the use of an overhead crane. is not desirable or necessary theouter end of the supporting member may be suspended by an auxiliarysupport from the ceiling. The motorand-parts directly asso ciat-edtherewith are located preferably with their center of gravity over thesupporting block so thatone part counterbalances the other'part.The-supporting member is made sulliciently-long to give a suitabledistance between driving centers and while itmay be formed of anysuitable material it is "decrease the overhang, drives two drivingbeltwheels which are belted toithe belt.

wheels of the drop hammer; and togive the correct directions of rotationto the driving belt wheels, so as to avoid the necessity of crossing oneof the belts, the motor shaft is connected to the same through suitablegear ing which serves to drive one belt wheel .in

one direction and the other in the oppositedirection. This' arrangementmeans that both belts cover the same amount of surface of the pulleys orbelt wheels thus insuring equal action on both sides. Furtheig the beltsare made long enough to havesome stretch when the load is applied and inthis manner aid in taking up'the 'shoclr'on the motor. lh-e specificstructure and arrangement of the supporting member-depends pri-- mainlyon the-size of'thc hammer. In the case of a small hammer it may comprisea single board. plank or beam. while. in the case of a larger hammeritmay be desirable to build up a framework fromltwo or moral-15 onfwhicha pinion dwhich meshes 13G 42 and 43 respectively.

' boards, planks or beams in order to obtain a support of the necessarystrength. Also it is so arranged as to preserve the arallel relation ofthe driving; and drivensiafts.

- Referring now to the drawing, the'sup-qo orting member illustratedcomprises a ilame built up of two side beams 19 and 20 with their endsheld in spaced relation to each other by suitable cross pieces, saidbeams being still enough to prevent buckling. In the present instancethe inner ends of the beams 19 and 20 are clamped between plates 21 andhinge irons 22 by bolts 23 andsuitable top and bottom cross pieces 24and 25 are riveted or otherwise fixed to so At the end surflanges onhinge irons 22. faces of beams 19 and 20 are angle iron braces 26rivet-ed to the hinge channel irons 22 which serve to take thelongitudinal thrust on beams :19, 20 due to the pull of the belt drive.This'relieve's the strain on bolts 23. Thel two hinge irons 22 terminatein eyes 27 through which )fLSSES a shaft28 carmed by arms 29 whicproject from side frames 9. By this arrangement'the inner end of thesupportine' member is hinged to the drop hammer. ilo the outer. ends ofbeams 19' and 20 are bolted channelirons 30, Fig. 2,,to which arefastened top and bottom cross pieces 31 and 32. Beneath the outer end oftheframe which forms the motor support isan auxiliary support, tower orcolumn 33 whi'chmay be built up in any suitable manner and on tower is acushion 34 upon which directly rests the bottom cross piece 32 tosupport the outer end of the supporting frame. The cushion should beofnon-resonant material and we have found a block of hard wood to besatisfactory for the purpose. This block prefer- 1 05 ably extendsacross the entire top of the tower so as to revent the outer end of theframe from twlsting as it tends to do under the action of the motor, flywheel and belts.

To prevent anys'ubstantial movement of the outer nd of the. supportingframe relative to tower33. bolts 35 are provided which pass v throughoversize openings in bottom cross pieces 32 and the top of tower 33. Thesaid bolts 35 serve also to hold the outer end of 1,15 the supportingframe from any substantial lateral movement, although owing to theoversize openings through which the bolts pass, an'a justing movement ispermitted case thedrop hammer should settle. I 1 20 Mounted on top crosspieces 31 is a gear casing which is split horizontally to form a bottomportion 36 and a cap 37 and supported by hearings in the gear casing areshafts 38'and 39 which carry on their adja- 1 25 cent ends gear wheels40 -and 41 respeetively and on their outer ends driving belt wheelsSupported by bearings 44 in the gear casing is a pinion shaft 1 on oosite sides with gear wheels 40 and 'to'r drive a new board may bereadily in 41. he pinion 46 when turned, therefore, serted inthe hammerwithout danger to the will drive gear wheels 40 and 41 in oppositerepair man because there need be no belts directionsf Shaft 45 projectsbeyond the or rollers in motion. The arrangement also casing at bothends and at one end it carries avoids the use of objectionable guy rodsand a fly wheel 47 which assists the motor in .the tensions on the beltmay be made uniform taking up the load and at its other end it eventhough the hammer itself gets slightly is coupled to shaft- 48 of amotor 49. Motor out of perpendicular. It also .has the ad- 49' ismounted on a'platform .50 which is vantage of saving power because it ispossiload.

bolted to the gear casing, the urpose being to obtain the 'full benefito beams without making them. unduly long. The motor, gearing-and flywheel may be considered as a single unit and such unit'is so located onthe end of the Supporting frame that its center of gravity comes overthe block 34. The (lIlVln' belt wheels 42 and 43 are belted to whee siltand '15 by bolts 51 and 52 which oiraccount of their.

elasticit assist the motor in taking up' (its nthis connection it shouldbe noted that the load is ver suddenly applied-to the motor andreleased: Fixed to the side of the supporting frame is a platform 53adjacent'which is a hand rail ng 54 for use of the-operator in attendingto the machine, and on'the sideof the tower is a ladder 55 for use inmountin to platform 53. x

.The operation 0' the motor in driving the drop hammer is obvious. thepinion 46 driving gear wheelsand 41 in o posite direc,

'tions which resultsjin drivur the belt wheels 42 'and 43, and'hence]'lt wheels 14 and 15, in oppositiondirect'ions. The fly wheel 47performs the usual func-, tion of storingenergy from the motor duringperiods of light load, which energy is relea'sed'to assist the motorduring periods of heavier loads. It also assists in counter balai'itingthe weight of the motor.

\V1th-the above described arrangement it will be seen that since thesupporting'member'or frame for the'motor is connected-t0 the drop hammerpreferably by hingin as shown. the driving belt wheels 42 ant 43 areheld correctly spaced-from belt wheels 1-1 and 15 .and are maintained.in correct alinement so that the belts 51 and ,52 will functionproperly. At the same time, how

ever. the fact that the outer end'of the sup-- porting; frame issupported by a material which absorbs vibrations and is non-resonant.'suflicient vibrations will not be transmitted from the hammerto themotor to dorange theoperation ofthe motor or to jar it to pieces, ortojar. loose' the associated parts. a It is also to be noted that with ourimproved arrangement no crossing of belts Y [to limitations of thedriving means. Fu'r-v ther. trouble with-one hammer does notaffect anyother. Due to its independentmothe wooden ble to have a complete shutdown while-the dies are being set or between heats or during relays .dueto any cause. Since the mecha- .nism is entirely independent of lineshaft-- ing it follows that overhead cranes may be cmployedto their fulladvantage. -In. :wcordance with the provisions of the patent statutes.we have described theprim ciple of operation-of-our invention. togetherivi h' theiapparatus which we now consider .to. representthe bestembodiment thereof; but we desire to -have it understood that theapparatus shown is only illustrative, and

' hammer, mechanism f ormoving the a'ctua tors wh ch includes drivingand driven wheels'a'n'd yielding means to absorb-the shock between thedriving wheels and the actuators an electric motor connected to thedriving wheels. means having one end fastened to and supported by theframe for holding th 'inotor and riving wheels in pre- 4 determinedposition with .respect to the driven wheels. and .an auxiliary supportfor the other end of said means.

2, In an apparatus .ofthe character described. the combination ofahammer. a

' stationary supporting and guiding lframe therefor. a pair of frictionrolls.'a rranged to raise and release the hzimmer. a driven wheel foreach roll. a driving wheel'for each driven wheel, a belt connecting cachdrivmg wheel with its driven wheel. said belts serving as driving meansand also as shock absorbing means. a member-having'one end" connected toand-supported by the frame. an electric motor supported at the other endof the member forrotating the driving wheels,-

and a support for the said otherend of the member. v

, 3.1m an apparatus of the character described. the. combination of ahammer, a stationary supporting and guiding frame therefor, a pair offriction rolls arranged to raise and release of the lmmmer..a' driven'wheel for each roll. a'driving wheel for each.

driven wheel. a belt conecting each driving wheel with its driven wheel,said belts serv 4, sw r ing as driving'means and also as shock absorbingmeans, a member hinged at one end to the frame, an electric motorsupported by scribed, the. combination of a hammer, a"

to raise and release the hammer, a drlven' stationary supporting andguiding frame therefor, a pair of friction rolls arranged wheel for eachroll, a driving wheel for each j driven wheel, a belt connecting eachdriving wheel with its driven wheel, said belts serving as driving meansand also as shock abs sorbing means, an electric motor which is commonto and drives both of the driving wheels, a support for the motorcomprising two members which are hinged to the main spaced relationwith; respect to :the main frame and also prevent lateral movement ofthe motor, and a vertical column arran ed near the outerend ofthesupport upon wh ch such outer end'l'rests.

5. In an apparatus of the character described, thecombination of amainframe, a,

' t"hammer, a board for actuating it','*a*pair of" friction rollsarranged to raise and release the board and hammer, a drivenwheel'foreach roll, saidi wheels being arranged on'opppsite sides of theframe, a supportingniemr which is located. at 'one' side of the frameand is attached thereto, a. pair 0; h

driving wheels mounted on oppositersides of the member, a pair of gearwheels located betwecn the driving wheels andconnected thereto, anelectric motor which drives both of the gears and is'carried" by thesupporting member near -its outer end, and means for supporting theouter end of said supporting member. A

' 6. In an apparatus of the character described, the combination of amain frame, a hammer, a board for actuating it, a pair of friction rollsarrangedito raise and release the board andthanimer, a driven wheel foreach roll, said wheels being arranged on of) posite sides of the frame,a pair of spaced non-resonant bars which are attached at one end to themain frame and are connected by a 1platform at their outerends, a pairofvbelt w eels and their shafts, means mounted on the platform forsupporting the shafts and wheels, gears mounted on the shafts for ro--tating them in opposite directions, anelectric motor having a drivinggear which meshes with the gears on the shafts, belts connecting thedriving and driven wheels, and an auxiliary support for said platform.

7. In an apparatus of the'character described, the combination-of a mainframe, a

hammer,- a board for actuating it, a pair of friction rolls arranged toraise and release the board and hammer, adriven wheel for" each roll,said wheels being arranged on opposite sides of the frame, a pair ofspaced non-resonant bars which are attached at one :end to the mainframe and are connected by a platform 'at their outer ends, a gear boxzo mounted on the platform, a pair of wheels and'shafts supported bythebox, gearinggin the box'for driving thesha fts in opposite directions,an electric motor carried by the 8. In' an apparatus of the characterdescribed, thecombination of a main frame, a hammer, a board foractuating-1t, a pair of friction rolls arranged to raise and releaseframe and which serve to hold the motor in gear box'and driving-a gearwhich meshes :of gravity of the gear box and motor;

the-boardand hammer, a driven wheel for a5 each roll, said wheels beingmounted on opposite" sides of the frame, a non-resonant supporthingedto'the frame at. its inner end and supported at its outer end, apair of driving wheels and their shafts mountedfoii '90 rections whichis located between the wheels and the main frame,'and means transmittingmotion from theldriving to the driven wheels." a

' 9. In an: apparatus of the character described, the combination of amain frame, a ammer, a board for actuating it, a pairof friction rollsarranged to raise and release the boardand hammer, a driven wheel foreach roll, said wheels being mounted on opposite sides of the frame, anon-resonant support hinged to the frame .at its inner end and supportedat its outer end, a pair of 1 05 driving wheels and their shafts mountedonthe outer end of the support, an electric motor for driving'saidwheels in opposite directions which'is located between the wheelsand outer end ofthe' motor shaft which in addition to'acting as suchacts as a co'unterbalancepand means for transmitting motion from thedriving to the driven wheels.

-the main frame, a fly wheel located on the 10. The combination in adrop hammer, of

a main frame, drop hammer mechanism car-. ried thereby, a nonresonantmember havin one end connected to and supported'by sai frame,a motorsupported onrtheiother end ofsaid member, and means-.cmhecting the motorto the drop hammer mechanism. 11. The combinationm a d-ropdiammer, of aframe, drop hammer mechanism-carried thereby, a. supporting memberhaving one end connected to and supported" by the frame, meanssupporting the other end of said member, a motor supported on the said.

last named end, ,and means connecting the motor to the'drop hammermechanism.

12 The combination in a drop hammer ,of

a supporting member having one end conneoted to the drop hammer, meansfor supporting the other end of said member, a motor anda pair ofdriving belt wheels mounted on. said'last named end, a gearingbetweenthe motor and said belt wheels wherer by the motor drives onebelt wheel in one said member, and driving belts connectingthe motor tothe drop hammer.

14. The combination in a drop hammer, of a main frame, drophamn'iermechanism carried thereby, a wooden beam having its inner endconnected to and supported by the drop hammer, means supporting itsouter end, a motor mounted on such outer end, and driving connectionsbetween the motor and thedrop hammer mechanism.

15. The combination in a drop hammer having two belt wheels which aredriven in drives said belt wheels in opposite directions, and beltsconnecting the last named belt wheels to the first named belt wheels.

16. The combination in a drop hammer having two belt wheels which aredriven in opposite directions, of a supporting member having its innerend fastened to the drop hammer frame, means for supporting the outerend of said member, a pair of shafts Supported at said outer end, eachhaving a belt wheel on one end and a gear wheel on the other end, adriving shaft extending at right angles to said first named shafts andhaving between its ends a gear wheel which meshes with the gear wheelson the first named shafts, a motor connected to one end of said drivingshaft, a fly wheel on the other end thereof, and means connecting saidbelt wheels together.

In witnesswhereof, we have hereunto set this th day of January, 19. OTISR. CLARK. CHARLES H. FRANKLIN.

our hands

